/*
 * Alloy Analyzer 4 -- Copyright (c) 2006-2008, Felix Chang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package edu.ut.ece382c.valloy.ast;

import edu.mit.csail.sdg.alloy4.Pos;
import edu.mit.csail.sdg.alloy4.ConstList;
import edu.mit.csail.sdg.alloy4.JoinableList;
import edu.mit.csail.sdg.alloy4.Err;

import static edu.ut.ece382c.valloy.ast.Type.EMPTY;

/**
 * Immutable; represents an illegal pred/fun call.
 *
 * <p> <b>Invariant:</b>  this.type==EMPTY && this.errors.size()>0
 */

public final class ExprBadCall extends Expr {

    /** The function. */
    public final Func fun;

    /** The unmodifiable list of arguments. */
    public final ConstList<Expr> args;

    /** The extra weight added to this node on top of the combined weights of the arguments. */
    public final long extraWeight;

    /** Caches the span() result. */
    private Pos span=null;

    /** {@inheritDoc} */
    @Override public Pos span() {
        Pos p=span;
        if (p==null) {
            p=pos.merge(closingBracket);
            for(Expr a:args) p=p.merge(a.span());
            span=p;
        }
        return p;
    }

    /** {@inheritDoc} */
    @Override public void toString(StringBuilder out, int indent, boolean newline) {
    	for(int i=0; i<indent && newline; i++) { out.append(' '); }
    	out.append(fun.label).append('[');
        for(int i=0; i<args.size(); i++) { 
        	if (i>0) 
        		out.append(", "); 
        	args.get(i).toString(out,indent,false); 
        }
        out.append(']');
    }

    /** Constructs an ExprBadCall object. */
    private ExprBadCall(Pos pos, Pos closingBracket, boolean ambiguous, Func fun, ConstList<Expr> args, JoinableList<Err> errors, long extraWeight, long weight) {
        super(pos, closingBracket, ambiguous, EMPTY, 0, weight, errors);
        this.fun=fun;
        this.args=args;
        this.extraWeight=extraWeight;
    }

    /** Constructs an ExprBadCall object. */
    public static Expr make(final Pos pos, final Pos closingBracket, final Func fun, ConstList<Expr> args, long extraPenalty) {
    	return new ExprBadCall(pos, closingBracket, false, fun, args, emptyListOfErrors, extraPenalty, extraPenalty);
    }

    /** {@inheritDoc} */
    public int getDepth() {
        int max = 1;
        for(Expr x: args) { int tmp=x.getDepth(); if (max<tmp) max=tmp; }
        return 1 + max;
    }

    /** {@inheritDoc} */
    @Override final<T> T accept(VisitReturn<T> visitor) throws Err { return visitor.visit(this); }
}
